<?php
    define('DB_HOST','localhost');
    define('DB_USER','liushuqi');
    define('DB_PASS','123456');
    define('DB_NAME','review_app');

    $conn = new mysqli(DB_HOST,DB_USER,DB_PASS,DB_NAME);

    if($conn->connect_error){
        die("连接失败" . $conn->connect_error);
    }

    echo "连接成功!";